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8085 Microprocessor Architecture Overview

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Saumitra Rukmangad
Saumitra Rukmangad

This is a slide for entire 8085 microprocessor.t's all the 8085 you ever needed.

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8085 INTRODUCTION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8085 INTRODUCTION ,[object Object],[object Object],[object Object],[object Object],[object Object]
8085 PIN DIAGRAM
8085 PIN DESCRIPTION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8085 PIN DESCRIPTION ,[object Object],[object Object],[object Object],[object Object],[object Object]
8085 PIN DESCRIPTION ,[object Object],[object Object],[object Object],[object Object],[object Object]
8085 ARCHITECTURE
Arithmetic and Logical group ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Arithmetic and Logical group ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],S Z X AC X P X CY
Register Group ,[object Object],[object Object],[object Object],[object Object],[object Object]
Register Group ,[object Object],[object Object],[object Object],[object Object],[object Object]
INSTRUCTION REGISTER,DECODER & CONTROL ,[object Object],[object Object],[object Object]
INTERRUPT CONTROL ,[object Object],SERIAL IO CONTROL GROUP ,[object Object]
INSTRUCTIONS SET OF 8085 DATA TRANSFER GROUP MOV Rd, Rs .(Move data from Rs to Rd). Example: MOV C,B. Move the content of register B to C. Initially After execution B=10H. B=10H. C=20H. C=10H. Flags Affected :No flags affected. Addressing mode: Register.
DATA TRANSFER GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DATA TRANSFER GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DATA TRANSFER GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DATA TRANSFER GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DATA TRANSFER GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DATA TRANSFER GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DATA TRANSFER GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DATA TRANSFER GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DATA TRANSFER GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMEIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ARITHMETIC GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LOGICAL GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LOGICAL GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LOGICAL GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LOGICAL GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LOGICAL GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LOGICAL GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LOGICAL GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LOGICAL GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LOGICAL GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LOGICAL GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LOGICAL GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BRANCH GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
CALL address(Unconditional CALL from address) ,[object Object],[object Object],[object Object],[object Object],[object Object]
BRANCH GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BRANCH GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BRANCH GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BRANCH GROUP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BRANCH GROUP ,[object Object],Instruction Address RST 0 0000H RST 1 0008H RST 2 0010H RST 3 0018H RST 4 0020H RST 5 0028H RST 6 0030H RST 7 0038H
STACK AND MACHINE CONTROL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
STACK AND MACHINE CONTROL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
STACK AND MACHINE CONTROL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ADDRESSING MODES OF 8085 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ADDRESSING MODES OF 8085 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ADDRESSING MODES OF 8085 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ADDRESSING MODES OF 8085 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ADDRESSING MODES OF 8085 ,[object Object],[object Object],[object Object],[object Object],[object Object]
PROGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
PROGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
PROGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
PROGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
TIMING AND STATE DIAGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
TIMING AND STATE DIAGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
TIMING AND STATE DIAGRAM ,[object Object]
TIMING AND STATE DIAGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
TIMING AND STATE DIAGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SUBROUTINE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SUBROUTINE ,[object Object],[object Object],[object Object],[object Object],[object Object]
8085 Memory Interfacing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8085 Memory Interfacing ,[object Object],[object Object],[object Object],[object Object],A 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 1 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 ADD 8000H 87FFH
8085 Memory Interfacing ,[object Object],[object Object],[object Object],[object Object]
8085 Memory Interfacing ,[object Object],A15-A8 Latch AD7-AD0 D 7 - D 0 A 7 - A 0 8085 ALE IO/M RD WR 2K Byte Memory Chip WR RD CS A 10 - A 0 A 15 - A 11 3:8DECODER
8085 Memory Interfacing ,[object Object],[object Object],[object Object],[object Object],[object Object]
8255 PIN DIAGRAM PA0-PA7 I/O Port A Pins PB0-PB7 I/O Port B Pins PC0-PC7 I/O Port C Pins D0-D7 I/O Data Pins RESET I Reset pin RD ¯ I Read input WR ¯ I Write input A0-A1 I Address pins CS ¯ I Chip select Vcc , Gnd I +5volt supply
8255 BLOCK DIAGRAM
8255 BLOCK DIAGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8255 BLOCK DIAGRAM A 0 ,A 1 decide the port to be used in 8255. A 1 A 0 Selected port 0 0 Port A 0 1 Port B 1 0 Port C 1 1 Control Register
8255 BLOCK DIAGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8255 BLOCK DIAGRAM ,[object Object],[object Object],[object Object],[object Object],[object Object]
8255 MODES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
INTERFACING 8085 & 8255 ,[object Object],[object Object],A15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Port 1 0 0 0 0 X X X X X X X X X 0 0 A 1 0 0 0 0 X X X X X X X X X 0 1 B 1 0 0 0 0 X X X X X X X X X 1 0 C 1 0 0 0 0 X X X X X X X X X 1 1 CW
INTERFACING 8085 & 8255 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
INTERFACING 8085 & 8255 8255 8085 3:8 decoder 74373 (AD0-AD7) D7-D0 A0-A7 /CS A0 A1 O0 O1 O7 A13 A12 A11 ALE RD ¯ WR ¯ RD¯ WR¯ G2A G2B G1 A15 A14 IO/M A B C PA PB PC
INTERFACING 8085 & 8255 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
INTERFACING STEPPER MOTOR with 8255
SERIAL COMMUNICATION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Transmitter Receiver
SERIAL COMMUNICATION ,[object Object],[object Object],[object Object],[object Object],[object Object],Transmitter/Receiver Receiver/Transmitter
SERIAL COMMUNICATION ,[object Object],[object Object],[object Object],Transmitter/Receiver Receiver/Transmitter.
TRANSMISSION FORMATS Asynchronous Synchronous ,[object Object],[object Object],2. Used for transfer data rates <20KBPS 2. Used for transfer data rates >20KBPS 3. Start and stop bit for each character which forms a frame. 3. No start and stop bit for each character. 4. Two Clocks are used for Tx and Rx 4. Single clock is used for both Tx and Rx.
INTERRUPTS IN 8085 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
INTERRUPTS IN 8085 ,[object Object],[object Object],[object Object],[object Object],[object Object]
INTERRUPTS IN 8085 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
INTERRUPTS IN 8085 ,[object Object],[object Object],Restart Instruction Equivalent to RST0 CALL 0000H RST1 CALL 0008H RST2 CALL 0010H RST3 CALL 0018H RST4 CALL 0020H RST5 CALL 0028H RST6 CALL 0030H RST7 CALL 0038H
INTERRUPT PRIORITY Interrupt name Mask-able Vectored TRAP No Yes RST 7.5 Yes Yes RST 6.5 Yes Yes RST 5.5 Yes Yes INTR YES NO
SIM INSTRUCTION RST5.5 Mask RST6.5 Mask RST7.5 Mask } 0 - Available 1 - Masked Mask Set Enable 0 - Ignore bits 0-2 1 - Set the masks according to bits 0-2 Force RST7.5 Flip Flop to reset Not Used Enable Serial Data 0 - Ignore bit 7 1 - Send bit 7 to SOD pin Serial Out Data ,[object Object],[object Object],SOD SDE XXX R7.5 MSE M7.5 M6.5 M5.5 0 1 2 3 4 5 6 7
SIM INSTRUCTION ,[object Object],[object Object],- Enable 5.5 bit 0 = 0 - Disable 6.5 bit 1 = 1 - Enable 7.5 bit 2 = 0 - Allow setting the masks bit 3 = 1 - Don’t reset the flip flop bit 4 = 0 - Bit 5 is not used bit 5 = 0 - Don’t use serial data bit 6 = 0 - Serial data is ignored bit 7 = 0 SDO SDE XXX R7.5 MSE M7.5 M6.5 M5.5 0 1 0 0 0 0 0 1 EI ; Enable interrupts including INTR MVI A, 0A ; Prepare the mask to enable RST 7.5, and 5.5, disable 6.5 SIM ; Apply the settings RST masks
RIM INSTRUCTION Serial Data In RST5.5 Interrupt Pending RST6.5 Interrupt Pending RST7.5 Interrupt Pending 0 - Available 1 - Masked Interrupt Enable Value of the Interrupt Enable Flip Flop RST5.5 Mask RST6.5 Mask RST7.5 Mask } ,[object Object],[object Object],SDI P7.5 P6.5 P5.5 IE M7.5 M6.5 M5.5 0 1 2 3 4 5 6 7
8253 PIT
8253 Features ,[object Object],[object Object],[object Object],[object Object],[object Object]
CONTROL WORD D0 D7 SC1 SC0 Select counter RL1 RL0 Read/Load SC1 SC0 RL1 RL0 M2 M1 M0 BCD 0 0 Counter0 0 1 Counter1 1 0 Counter2 1 1 ILLEGAL 0 0 Counter latching 0 1 Read/load LSB 1 0 Read/load MSB 1 1 R/L MSB 1 st then LSB.
CONTROL WORD M2 M1 M0 BCD =0 Binary counter BCD =1 BCD counter 0 0 0 Mode 0 0 0 1 Mode 1 X 1 0 Mode 2 X 1 1 Mode 3 1 0 0 Mode 4 1 0 1 Mode 5
8253 SQUARE WAVE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
8253 SQUARE WAVE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DMA
8257 DMA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
OPERRATING MODES OF 8257 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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8085 Microprocessor Architecture Overview

  • 1.
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  • 3. 8085 PIN DIAGRAM
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  • 14. INSTRUCTIONS SET OF 8085 DATA TRANSFER GROUP MOV Rd, Rs .(Move data from Rs to Rd). Example: MOV C,B. Move the content of register B to C. Initially After execution B=10H. B=10H. C=20H. C=10H. Flags Affected :No flags affected. Addressing mode: Register.
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  • 80. 8255 PIN DIAGRAM PA0-PA7 I/O Port A Pins PB0-PB7 I/O Port B Pins PC0-PC7 I/O Port C Pins D0-D7 I/O Data Pins RESET I Reset pin RD ¯ I Read input WR ¯ I Write input A0-A1 I Address pins CS ¯ I Chip select Vcc , Gnd I +5volt supply
  • 82.
  • 83. 8255 BLOCK DIAGRAM A 0 ,A 1 decide the port to be used in 8255. A 1 A 0 Selected port 0 0 Port A 0 1 Port B 1 0 Port C 1 1 Control Register
  • 84.
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  • 89. INTERFACING 8085 & 8255 8255 8085 3:8 decoder 74373 (AD0-AD7) D7-D0 A0-A7 /CS A0 A1 O0 O1 O7 A13 A12 A11 ALE RD ¯ WR ¯ RD¯ WR¯ G2A G2B G1 A15 A14 IO/M A B C PA PB PC
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  • 100. INTERRUPT PRIORITY Interrupt name Mask-able Vectored TRAP No Yes RST 7.5 Yes Yes RST 6.5 Yes Yes RST 5.5 Yes Yes INTR YES NO
  • 101.
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  • 106. CONTROL WORD D0 D7 SC1 SC0 Select counter RL1 RL0 Read/Load SC1 SC0 RL1 RL0 M2 M1 M0 BCD 0 0 Counter0 0 1 Counter1 1 0 Counter2 1 1 ILLEGAL 0 0 Counter latching 0 1 Read/load LSB 1 0 Read/load MSB 1 1 R/L MSB 1 st then LSB.
  • 107. CONTROL WORD M2 M1 M0 BCD =0 Binary counter BCD =1 BCD counter 0 0 0 Mode 0 0 0 1 Mode 1 X 1 0 Mode 2 X 1 1 Mode 3 1 0 0 Mode 4 1 0 1 Mode 5
  • 108.
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  • 110. DMA
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